Carbon Offsetting

Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) is a market-based mechanism developed by ICAO to help the aviation industry reach its “aspirational goal” to make all growth in international flights after 2020 “carbon neutral”.

CORSIA is a carbon offsetting measure, under which international flights covered by the scheme are required to develop a monitoring, reporting and verification (MRV) system and purchase emissions units from other sectors to offset the growth in international aviation emissions over 2020 levels.

CORSIA applies to international flights between participating States by aircraft operators that produces annual CO2 emissions greater than 10 000 tonnes from the use of an aeroplane(s) with a maximum certificated take-off mass greater than 5 700 kg conducting international flights, with the exception of humanitarian, medical and firefighting flights.

The figures in the table below showing predicted CO2 emissions are for illustrative purposes only, are based on average seating and stage length of 600nm and may vary from flight to flight. Another useful measure to consider is that 10,000 tonnes of CO2 emissions are roughly equivalent to one million U.S. gallons or 4 million litres of fuel.

Aircraft Type @400 Hrs/Yr @900 Hrs/Yr
  Tonnes of CO2 Tonnes of CO2
ACJ319 2857 6429
BBJ737 2920 6569
Bombardier 605 1270 2857
Bombardier Global Express 2051 4615
Cessna Mustang 348 783
Cessna Sovereign 1081 2432
Embraer 100 421 947
Embraer 300 672 1513
Falcon 2000LXS 1081 2432
Gulfstream G450 2000 4500
Gulfstream G550 1739 3913
Gulfstream G650 1932 4348

CORSIA requirements are specified in ICAO Annex 16 Vol IV and enacted in the law of participating States.

For a list of participating States, please see:

The Isle of Man (as a Crown Dependency of the UK) falls under the UK signatory to the Chicago Convention and the UK’s declaration of participation in CORSIA.

The ICAO CORSIA requirements create no direct relationship between the aircraft and the State of aircraft registration.

ICAO Annex 16 Vol IV requires that the attribution of an aircraft to a State as follows:

  • For aircraft operating under an AOC – the State that issued the AOC.
  • For an aircraft that has been issued an ICAO designator – the State that has issued the designator.
  • For all other aircraft – the aircraft owner will be considered to be the aircraft operator for the purposes of CORSIA and the aircraft shall be attributed to the State of aircraft operator’s registration as juridical person or the State of residence and registration of the aeroplane owner.

Therefore, the only M- registered aircraft that need to follow Isle of Man CORSIA processes are those where the owner is registered as a juridical person or who is resident in the Isle of Man.

Aircraft attributed to the Isle of Man under CORSIA shall follow UK CORSIA processes and procedures.

The UK Environment Agency is the Isle of Man’s administering authority for CORSIA purposes and their role includes:

  • Authorising Emissions Monitoring Plans, which set out the methodology to be used by the operator to monitor their emissions;
  • Reporting aggregated emissions and emissions units cancelled to ICAO; and
  • Providing guidance and support to operators to help them comply with the scheme.

Currently the processes are limited to the monitoring, verification and reporting of CO2 emissions (MVR).

Qualifying aircraft operators should submit their Emissions Monitoring Plan (EMP), to the UK Environment Agency for its approval.

The UK is in the process of enacting CORSIA in domestic legislation.

UK Environment Agency contact:

  • Email: [email protected]
  • Telephone: 03708 506 506 - Telephone from outside the UK (Monday to Friday, 8am to 6pm GMT): +44 (0) 114 282 5312

Any operator who doesn’t have an in-house monitoring system for their emissions will eligible to use the CORSIA Emissions Reporting Tool (CERT), which has been developed by ICAO especially for small emitters who emit less than 500,000 tonnes of CO2 a year.

For those operators who do have an internal monitoring process, or fuel monitoring software, the ICAO CORSIA CO2 Estimation Models (CEMs) can be integrated into these systems so that monitoring for CORSIA can be achieved within your own systems. More information can also be obtained about this from the ICAO CERT page.

The EU ETS was originally introduced in 2005 to drive emissions reduction improvements in the energy and industrial sectors.

It is understood that the EU are considering options to address the interaction of future offsetting of CO2 emissions under CORSIA and the existing EU ETS processes

The UK has retained the ETS post Brexit through a ‘UK-ETS’. The UK has acknowledged that without policy action, CO2 emissions above the CORSIA baseline from international flights departing from the UK to the European Economic Area would incur obligations from both the UK ETS and CORSIA, leading to aeroplane operators being charged twice for these emissions. Consequently, options are being developed by the UK to appropriately address the interaction between CORSIA and the UK ETS and it is expected that there will then be a consultation in 2021 on the detailed policy design of any interaction between the 2 schemes.